migrate index.js to typescript

src/index-main.ts

@@ -0,0 +1,35 @@
+import uaParser from 'ua-parser-js';
+
+function isMobileDevice(): boolean {
+    if (!navigator.userAgent) {
+        return false;
+    }
+
+    const uaParseRet = uaParser(navigator.userAgent);
+
+    if (!uaParseRet || !uaParseRet.device) {
+        return false;
+    }
+
+    const device = uaParseRet.device;
+
+    if (device.type === 'mobile' || device.type === 'wearable' || device.type === 'embedded') {
+        return true;
+    }
+
+    return false;
+}
+
+function navigate(type: string): void {
+    if (__EZBOOKKEEPING_IS_PRODUCTION__) {
+        window.location.replace(`${type}/`);
+    } else {
+        window.location.replace(`${type}.html`);
+    }
+}
+
+if (isMobileDevice()) {
+    navigate('mobile');
+} else {
+    navigate('desktop');
+}